Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e103dc12e7ab29…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 07:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23fd3a9ce0aefbee262eb4613010c0ba SHA-1: e46d2bb3c45326f15c7c48f2343896fc11673241 SHA-256: 45e103dc12e7ab2933adba8bbe94dd10795761252ae2c4e48230c02eeee95e0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cowichanseniors.ca/userfiles/file/69521081328.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fisakowapogolemosovuvob.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778a39bcd6d---19431037612.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a868b648---65871515715.pdf
    • https://clubslotalmatriche.com/calcas/file/nugirusukogijetazok.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f226461734456c59fbbdbe9903537bcf/35621142445.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e9cc34c2---gomofijuxaxemuwazad.pdf
    • http://studiogaleazzo.eu/userfiles/files/10443190068.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16eec9c2b---wizorimujoguwirekasusus.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3cc38ce7---70662860249.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1f2c9671---kanosojejidumodase.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7bca679756812f2f7d92d59f3382dc87/88807361240.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5b0b064aabb0d04f95e0ea627e89375c/fosizinevusupi.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d084571e848---tobosufude.pdf
    • http://avision-italia.com/userfiles/files/gixile.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bd49ad8160a2d6d15512e9868f4d8f24/vozeb.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/zikudibiwimalisi.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609846d4a8dae---44099443112.pdf
    • http://grandinhr.eu/images/user/file/kakumebewemuzafotawuded.pdf
    • https://dovolena-jiznicechy.cz/uploads/fudegutapoletofisela.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/41912c9fbd89705d84145f2b2a1431a7/77207334052.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/16f9b3590bcbddca02121675ecfdc72e/66205037741.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a7e0569bdc8b696a77cb79633ca90bac/rewinekokuwepiwonuvore.pdf
    • https://marblobaths.com/app/webroot/img/files/wewurafuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=butterfly+extreme+mix
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3a.bin
efca4c19c471c746dbfcd125d57cfa9082d0e368096b47534dfdf65129844594
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3A 16616 bytes
font_01_sfnt_off0000e540.bin
f784b4617a4b6e53a403f1ec4e33bb65c399f19e917023463c436c3329f37f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 10188 bytes
font_02_sfnt_off0000fc26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 16792 bytes
font_03_sfnt_off00011434.bin
b8df3826a64631a76d380b81a2b87c79658b73022abcfaaaa4438c62e207fc19
pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 14900 bytes